Mechanism and development direction of CO2-EGR
Injecting CO2 into depleted gas reservoirs can simultaneously achieve enhanced oil recovery and CO2 geological storage, offering broad application prospects under the "dual carbon" background. Currently, CO2-EGR（CO2 enhanced gas recovery） is still largely in the theoretical research phase....
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Editorial Department of Petroleum Reservoir Evaluation and Development
2024-12-01
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| Series: | Youqicang pingjia yu kaifa |
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| Online Access: | https://red.magtech.org.cn/fileup/2095-1426/PDF/1733807873144-2018047895.pdf |
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| author | ZHU Haonan, CAO Cheng, ZHANG Liehui, ZHAO Yulong, PENG Xian, ZHAO Zihan, CHEN Xingyu |
| author_facet | ZHU Haonan, CAO Cheng, ZHANG Liehui, ZHAO Yulong, PENG Xian, ZHAO Zihan, CHEN Xingyu |
| author_sort | ZHU Haonan, CAO Cheng, ZHANG Liehui, ZHAO Yulong, PENG Xian, ZHAO Zihan, CHEN Xingyu |
| collection | DOAJ |
| description | Injecting CO2 into depleted gas reservoirs can simultaneously achieve enhanced oil recovery and CO2 geological storage, offering broad application prospects under the "dual carbon" background. Currently, CO2-EGR（CO2 enhanced gas recovery） is still largely in the theoretical research phase. To address the unclear mechanisms, this review summarizes the mechanisms of CO2-EGR in different gas reservoirs. For conventional gas reservoirs, the mechanisms include pressure restoration and displacement effects, gravity segregation, viscosity-difference-assisted displacement, and dissolution-enhanced reservoir modification. For condensate gas reservoirs, pressure-maintained production is possible, along with viscosity reduction, dissolution expansion, and extraction-deblocking effects. For shale gas, coalbed methane, and tight gas reservoirs, the adsorption displacement effect is more significant. In water-bearing gas reservoirs, injecting CO2 can effectively inhibit water invasion. The contributions of each enhanced recovery mechanism to different types of gas reservoirs vary. CO2-EGR has been proven feasible at the theoretical level, but to achieve field application, further breakthroughs are needed in several areas, including gas phase characteristics of mixed gases, diffusion and gas mixing mechanisms, enhanced recovery potential evaluation, and characterization of enhanced recovery mechanisms. Research shows that injecting CO2 into depleted gas reservoirs can restore formation pressure and replenish formation energy. Due to physical property differences, a stable displacement process is formed, achieving enhanced recovery under the combined action of multiple mechanisms. It is a highly promising method for increasing production. |
| format | Article |
| id | doaj-art-23061d9bc5b64a3cac73cc8b2eff281e |
| institution | OA Journals |
| issn | 2095-1426 |
| language | zho |
| publishDate | 2024-12-01 |
| publisher | Editorial Department of Petroleum Reservoir Evaluation and Development |
| record_format | Article |
| series | Youqicang pingjia yu kaifa |
| spelling | doaj-art-23061d9bc5b64a3cac73cc8b2eff281e2025-08-20T02:03:05ZzhoEditorial Department of Petroleum Reservoir Evaluation and DevelopmentYouqicang pingjia yu kaifa2095-14262024-12-0114697598010.13809/j.cnki.cn32-1825/te.2024.06.020Mechanism and development direction of CO2-EGRZHU Haonan, CAO Cheng, ZHANG Liehui, ZHAO Yulong, PENG Xian, ZHAO Zihan, CHEN Xingyu01. State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China;2. Institute of Carbon Neutrality, Southwest Petroleum University, Chengdu, Sichuan 610500, China;3. Exploration and Development Research Institute, PetroChina Southwest Oil & Gas Field Company, Chengdu, Sichuan 610041, ChinaInjecting CO2 into depleted gas reservoirs can simultaneously achieve enhanced oil recovery and CO2 geological storage, offering broad application prospects under the "dual carbon" background. Currently, CO2-EGR（CO2 enhanced gas recovery） is still largely in the theoretical research phase. To address the unclear mechanisms, this review summarizes the mechanisms of CO2-EGR in different gas reservoirs. For conventional gas reservoirs, the mechanisms include pressure restoration and displacement effects, gravity segregation, viscosity-difference-assisted displacement, and dissolution-enhanced reservoir modification. For condensate gas reservoirs, pressure-maintained production is possible, along with viscosity reduction, dissolution expansion, and extraction-deblocking effects. For shale gas, coalbed methane, and tight gas reservoirs, the adsorption displacement effect is more significant. In water-bearing gas reservoirs, injecting CO2 can effectively inhibit water invasion. The contributions of each enhanced recovery mechanism to different types of gas reservoirs vary. CO2-EGR has been proven feasible at the theoretical level, but to achieve field application, further breakthroughs are needed in several areas, including gas phase characteristics of mixed gases, diffusion and gas mixing mechanisms, enhanced recovery potential evaluation, and characterization of enhanced recovery mechanisms. Research shows that injecting CO2 into depleted gas reservoirs can restore formation pressure and replenish formation energy. Due to physical property differences, a stable displacement process is formed, achieving enhanced recovery under the combined action of multiple mechanisms. It is a highly promising method for increasing production.https://red.magtech.org.cn/fileup/2095-1426/PDF/1733807873144-2018047895.pdf|ccus|co2 flooding|egr（enhanced gas recovery）|mechanism review|natural gas reservoir |
| spellingShingle | ZHU Haonan, CAO Cheng, ZHANG Liehui, ZHAO Yulong, PENG Xian, ZHAO Zihan, CHEN Xingyu Mechanism and development direction of CO2-EGR Youqicang pingjia yu kaifa |ccus|co2 flooding|egr（enhanced gas recovery）|mechanism review|natural gas reservoir |
| title | Mechanism and development direction of CO2-EGR |
| title_full | Mechanism and development direction of CO2-EGR |
| title_fullStr | Mechanism and development direction of CO2-EGR |
| title_full_unstemmed | Mechanism and development direction of CO2-EGR |
| title_short | Mechanism and development direction of CO2-EGR |
| title_sort | mechanism and development direction of co2 egr |
| topic | |ccus|co2 flooding|egr（enhanced gas recovery）|mechanism review|natural gas reservoir |
| url | https://red.magtech.org.cn/fileup/2095-1426/PDF/1733807873144-2018047895.pdf |
| work_keys_str_mv | AT zhuhaonancaochengzhangliehuizhaoyulongpengxianzhaozihanchenxingyu mechanismanddevelopmentdirectionofco2egr |